I recently traded in a 2011 BMW 535ix, which I found to be one of the most uncomfortable cars I have ever owned, on a 2013 S550, which is the most comfortable car I have ever owned. The car is absolute serenity to drive. No wind noise; no engine noise; no tire noise. The V8 is 430hp/520lb-ft of pure butter. Sure, the car is big and heavy, but it carries its heft very well and it does not claim to be the ultimate driving machine (whereas the BMW did, and it was far from it). The S550's adaptive air suspension is more butter, and it keeps the car stable and level, even during spirited driving.
